Grinder head



W. H. JAEGER GRINDER HEAD iled Oct. 12. 1921 by I ll'l Patented Get. 7, 1924.

UNITED STATES Lamas PATENT OFFICE.

WILLIAM H. JAEGER, OF TRENTON, NEW JERSEY, ASSIGNOR TO.TRENTON PATENT MANUFACTURING 00., OF TRENTON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

GRINDER HEAD.

Application filed October 12, 1921. Serial N0. 507,305.

To all whom it may concern:

Be it known that 1, WILLIAM H. JAnonn, a citizen of the United States, residing at Trenton, in the county of Mercer and State of New Jersey, have invented certain newand useful Improvements in Grinder Heads, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain improve ments in grinder heads and has relation more particularly to a device of this general character especially designed and adapted for use in connection with curved surfaces, and it is primarily an object of the invention to provide a novel and improved device of this general character adapted for use in connection with cylinders and more especially for the internal 2 grinding of cylinders.

Another object of the invention is to provide a novel and improved device of this general character comprising a chuck or body provided with a series of grinding elements, together with means whereby said elements may be radially adjusted in accordance with the necessities of practice.

Furthermore, it is an object of the invention to provide a novel and improved device of this general character comprising a plurality of grinding elements constructed and assembled in a manner whereby the dust, particularly during an internal grinding operation, is blown away.

It is also an object of the invention to provide a novel and improved device of this general character. comprising a supporting chuck or body having a plurality of grinding elements associated therewith, together with means whereby the elements are effectively held in applied position upon the chuck or body and particularly held against displacement due to centrifugal force.

The invention consists in the details of construction and in the combination and arrangement of theseveral parts of my improved grinder head whereby certain important advanta es are attained and the device rendered simpler, less expensive and otherwise more convenient and advanta goons for use, as will be hereinafter more full set forth.

The novel features of my invention will hereinafter be definitely claimed.

I In order that my invention may be the better understood, T will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure l is a view in front elevation of a grinder head constructed in accordance with an embodiment of my invention;

Figure 2 is a view partly in side elevation and partly in section of the head as herein embodied;

Figure 3 is an elevational view of the device as herein set forth;

Figure 4 is a view in elevation of one of the dogs comprised in the device as herein set forth; and

Figure 5 is an elevational view of the scroll gear herein employed.

As disclosed in the accompanying drawings, 0 denotes a hollow chuck or body comprised in my improved grinder head and .which has its rear face 1 removable, said face 1 being adapted for attachment, as at 2, in a conventional manner with a driven element 3.

Carried by the outer face. portion of the chuck or body 0 is a plurality of dogs 4 movable radially of the chuck or body C, there being a dog 4 for each of the grinding segments 5. The outer face of each of the dogs 4 is inclined downwardly or inwardly toward the axial center of the chuck or body C and said inclined face has substantial contact at all points with a similarly inclined face of an inwardly directedlug or rib 6 carried by the central portion of a grinding segment 5.

Disposed through the segments 5 and the lug or rib 6 and engaged with the associated dog 4 are the holding or clamping bolts 7. The heads of the bolts 7 are outwardly dispwed and have direct contact with a metallic plate 8 overlying the outer face of the segment 5 at the central portion thereof, as is particularly illustrated in the accompanying drawings.

The end edges of adjacent segments 5 are spaced apart, as clearly illustrated in Figures 1 and 3 of the accompanyin drawings, and said edges 9 are correspon 'ngly beveled and on such an inclination as to have adjacent edges 9 in overlying relation. The bevels 9 provide eflective means whereby, during a' working operation and particularly during the internal grinding of a cylinder, the resultant dust is efi'ectively blown away, whereby the grinding operation is i from the inner extremlties of said ends to" materially facilitated. It is also to be understood that the end edges of the segments are substantially radial to the axial center at the chuck or body C when the segments are in applied position whereby the opposed edges 9 of the adjacent segments 5 are spaced apart a gradually increasing distance the outer extremities thereof.

The segments are formed of emery or kindred material and, as clearly illustrated in the accompanying drawings, the outer or working edges of said segments 5 are arcuate and on substantially the same radii.

The contacting inclined faces of the dogs 4 and the lugs or ribs 6 of the segments 5 serve eflectually to hold the segments against displacement due to centrifugal force.

The segments 5 are adapted to be radially adjusted in accordance with the necessities of practice and the adjustment of the segments 5 is effected in unison throughthe instrumentality of a scroll gear 10 rotatably mounted within the chuck or body C and meshing with the inner faces of the dogs 4. The scroll gear 10 is also provided with a bevel gear 11 having in mesh therewith the pinions 12.

The pinions 12 are preferably equi-distantly spaced circumferentially of the chuck or body C and are carried by the stub shafts 14 disposed through and rotatably supported by the peripheral wall of the chuck or body C. The outer end portion of each of theshafts 14 is provided with a socket 15 to receive a suitable wrench or tool so 'that a pinion 12 may be rotated to effect the desired radial adjustment of the segments 5. V

The pinions 12 also serve to maintain 'the scroll gear 10 in working position and by having all of the shafts 1 1 provided with sockets 15, any one of the inions 12 may be employed to effect an ad ustment of the segments 5 which, in practice, is of decided advantage and convenience as the operator is not required to turn the chuck or body C as a whole to locate any one particular pinion 12.

It is to be particularly noted that the inner edges of the segments 5 are provided with the inbows a arcuate in form and substantially on the sameradii. By this means, the segments 5 define a circular central 0 ening in which is adapted to be inserted a s aft or other parts for external rinding. The segments 5 are to be expande or contracted, as hereinbefore set forth, in order that said segments 5 may be relatively adjusted in accordance with the tice necessitated by t e work inserted through said central opening for external grinding.

The bevels 9 provide grooves of such angle to carry dust and dirt away and thereuirements of prac by prevent the device from gumming or filling up.

From thought to be obvious that a grinder head constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some change and modification without departing from the principles and spirit thereof and for this reason I do not wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in prac tice except as hereinafter claimed.

I claim:

1. As a new article of manufacture, a grinding head comprising a body,'dogs carried thereby and adjustable radially thereof, means for adjusting the dogs, and a'grinding segment secured to each of the dogs, said dogs and segments having contacting glgrdfaces inclined toward the center of the 2. As a new article of manufacture, a grinding head comprising a hollow bod having a central opening in a face wa thereof, said face wall having slots radiating from the central openin and in communication therewith, dogs 3 idably mounted within the slots, means within the body engaging the dogs for adjusting the same lengthwise of the slots, and grinding segments exteriorly of the body and carried by the dogs.

3. As a new article of manufacture, a grinding head comprising a hollow bod having a central opening in a face W 1 thereof, said face wall having slots radiating from the central opening and in communication therewith, dogs slidably mounted within the slots, means within the body engaging the dogs for adjusting the same lengthwise of the slots, grinding segments exteriorly of the body and carried by the dogs, the inner edges of the segments being spaced from the axial center of the body to provide acentral opening, said central opening permitting external grinding by the segment-of a member inserted in said open- As a new article of manufacture, a grinding head comprising a hollow bod having a central opening in a face we thereof, said face 'wall having slots radiating from the central opening and in communication therewith, dogs slidably mounted within the slots, means within the body the foregoing description it is extri orly of the body and earned y the dogs, the inner edges of the segments being p ced from the axial center of the body to provfle n central opening, said central opening poi-mitt external grinding by the segment of a w inserted in said opening, the outer edges of the segments extend- 5 ing beyond the periphery of the y and efi'ording grinding surfaces.

5. As a new article of nnfacture, a. grinding heed comprising n hollow body having a central opeg in a face wail 10 thereof, said f wall having slots radiating from the central openin and in commnnication therewith, dogs sfidably mounted within the slots, & gear within-the y engaging the dogs for moving the dogs lengthwise of the slots upon rotation of the gear, and ms for rotating the gwr.

In testimony whereof I hereunto n my signnt m: LI H. Jenna 

